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  <script type="text/javascript">
    var dom = document.getElementById('container');
    var myChart = echarts.init(dom, null, {
      renderer: 'canvas',
      useDirtyRect: false
    });
    var app = {};
    
    var option;

    // Schema:
// date,AQIindex,PM2.5,PM10,CO,NO2,SO2
const schema = [
  { name: 'AQIindex', index: 1, text: 'AQI' },
  { name: 'PM25', index: 2, text: 'PM 2.5' },
  { name: 'PM10', index: 3, text: 'PM 10' },
  { name: 'CO', index: 4, text: 'CO' },
  { name: 'NO2', index: 5, text: 'NO₂' },
  { name: 'SO2', index: 6, text: 'SO₂' },
  { name: '等级', index: 7, text: '等级' }
];
const rawData = [
  [55, 9, 56, 0.46, 18, 6, '良', '北京'],
  [25, 11, 21, 0.65, 34, 9, '优', '北京'],
  [56, 7, 63, 0.3, 14, 5, '良', '北京'],
  [33, 7, 29, 0.33, 16, 6, '优', '北京'],
  [42, 24, 44, 0.76, 40, 16, '优', '北京'],
  [82, 58, 90, 1.77, 68, 33, '良', '北京'],
  [74, 49, 77, 1.46, 48, 27, '良', '北京'],
  [78, 55, 80, 1.29, 59, 29, '良', '北京'],
  [267, 216, 280, 4.8, 108, 64, '重度', '北京'],
  [185, 127, 216, 2.52, 61, 27, '中度', '北京'],
  [39, 19, 38, 0.57, 31, 15, '优', '北京'],
  [41, 11, 40, 0.43, 21, 7, '优', '北京'],
  [64, 38, 74, 1.04, 46, 22, '良', '北京'],
  [108, 79, 120, 1.7, 75, 41, '轻度', '北京'],
  [108, 63, 116, 1.48, 44, 26, '轻度', '北京'],
  [33, 6, 29, 0.34, 13, 5, '优', '北京'],
  [94, 66, 110, 1.54, 62, 31, '良', '北京'],
  [186, 142, 192, 3.88, 93, 79, '中度', '北京'],
  [57, 31, 54, 0.96, 32, 14, '良', '北京'],
  [22, 8, 17, 0.48, 23, 10, '优', '北京'],
  [39, 15, 36, 0.61, 29, 13, '优', '北京'],
  [94, 69, 114, 2.08, 73, 39, '良', '北京'],
  [99, 73, 110, 2.43, 76, 48, '良', '北京'],
  [31, 12, 30, 0.5, 32, 16, '优', '北京'],
  [42, 27, 43, 1, 53, 22, '优', '北京'],
  [154, 117, 157, 3.05, 92, 58, '中度', '北京'],
  [234, 185, 230, 4.09, 123, 69, '重度', '北京'],
  [160, 120, 186, 2.77, 91, 50, '中度', '北京'],
  [134, 96, 165, 2.76, 83, 41, '轻度', '北京'],
  [52, 24, 60, 1.03, 50, 21, '良', '北京'],
  [46, 5, 49, 0.28, 10, 6, '优', '北京'],
  [26, 37, 27, 1.163, 27, 13, '优', '广州'],
  [85, 62, 71, 1.195, 60, 8, '良', '广州'],
  [78, 38, 74, 1.363, 37, 7, '良', '广州'],
  [21, 21, 36, 0.634, 40, 9, '优', '广州'],
  [41, 42, 46, 0.915, 81, 13, '优', '广州'],
  [56, 52, 69, 1.067, 92, 16, '良', '广州'],
  [64, 30, 28, 0.924, 51, 2, '良', '广州'],
  [55, 48, 74, 1.236, 75, 26, '良', '广州'],
  [76, 85, 113, 1.237, 114, 27, '良', '广州'],
  [91, 81, 104, 1.041, 56, 40, '良', '广州'],
  [84, 39, 60, 0.964, 25, 11, '良', '广州'],
  [64, 51, 101, 0.862, 58, 23, '良', '广州'],
  [70, 69, 120, 1.198, 65, 36, '良', '广州'],
  [77, 105, 178, 2.549, 64, 16, '良', '广州'],
  [109, 68, 87, 0.996, 74, 29, '轻度', '广州'],
  [73, 68, 97, 0.905, 51, 34, '良', '广州'],
  [54, 27, 47, 0.592, 53, 12, '良', '广州'],
  [51, 61, 97, 0.811, 65, 19, '良', '广州'],
  [91, 71, 121, 1.374, 43, 18, '良', '广州'],
  [73, 102, 182, 2.787, 44, 19, '良', '广州'],
  [73, 50, 76, 0.717, 31, 20, '良', '广州'],
  [84, 94, 140, 2.238, 68, 18, '良', '广州'],
  [93, 77, 104, 1.165, 53, 7, '良', '广州'],
  [99, 130, 227, 3.97, 55, 15, '良', '广州'],
  [146, 84, 139, 1.094, 40, 17, '轻度', '广州'],
  [113, 108, 137, 1.481, 48, 15, '轻度', '广州'],
  [81, 48, 62, 1.619, 26, 3, '良', '广州'],
  [56, 48, 68, 1.336, 37, 9, '良', '广州'],
  [82, 92, 174, 3.29, 0, 13, '良', '广州'],
  [106, 116, 188, 3.628, 101, 16, '轻度', '广州'],
  [118, 50, 0, 1.383, 76, 11, '轻度', '广州'],
  [91, 45, 125, 0.82, 34, 23, '良', '上海'],
  [65, 27, 78, 0.86, 45, 29, '良', '上海'],
  [83, 60, 84, 1.09, 73, 27, '良', '上海'],
  [109, 81, 121, 1.28, 68, 51, '轻度', '上海'],
  [106, 77, 114, 1.07, 55, 51, '轻度', '上海'],
  [109, 81, 121, 1.28, 68, 51, '轻度', '上海'],
  [106, 77, 114, 1.07, 55, 51, '轻度', '上海'],
  [89, 65, 78, 0.86, 51, 26, '良', '上海'],
  [53, 33, 47, 0.64, 50, 17, '良', '上海'],
  [80, 55, 80, 1.01, 75, 24, '良', '上海'],
  [117, 81, 124, 1.03, 45, 24, '轻度', '上海'],
  [99, 71, 142, 1.1, 62, 42, '良', '上海'],
  [95, 69, 130, 1.28, 74, 50, '良', '上海'],
  [116, 87, 131, 1.47, 84, 40, '轻度', '上海'],
  [108, 80, 121, 1.3, 85, 37, '轻度', '上海'],
  [134, 83, 167, 1.16, 57, 43, '轻度', '上海'],
  [79, 43, 107, 1.05, 59, 37, '良', '上海'],
  [71, 46, 89, 0.86, 64, 25, '良', '上海'],
  [97, 71, 113, 1.17, 88, 31, '良', '上海'],
  [84, 57, 91, 0.85, 55, 31, '良', '上海'],
  [87, 63, 101, 0.9, 56, 41, '良', '上海'],
  [104, 77, 119, 1.09, 73, 48, '轻度', '上海'],
  [87, 62, 100, 1, 72, 28, '良', '上海'],
  [168, 128, 172, 1.49, 97, 56, '中度', '上海'],
  [65, 45, 51, 0.74, 39, 17, '良', '上海'],
  [39, 24, 38, 0.61, 47, 17, '优', '上海'],
  [39, 24, 39, 0.59, 50, 19, '优', '上海'],
  [93, 68, 96, 1.05, 79, 29, '良', '上海'],
  [188, 143, 197, 1.66, 99, 51, '中度', '上海'],
  [174, 131, 174, 1.55, 108, 50, '中度', '上海'],
  [187, 143, 201, 1.39, 89, 53, '中度', '上海']
];
const CATEGORY_DIM_COUNT = 6;
const GAP = 2;
const BASE_LEFT = 5;
const BASE_TOP = 10;
// const GRID_WIDTH = 220;
// const GRID_HEIGHT = 220;
const GRID_WIDTH = (100 - BASE_LEFT - GAP) / CATEGORY_DIM_COUNT - GAP;
const GRID_HEIGHT = (100 - BASE_TOP - GAP) / CATEGORY_DIM_COUNT - GAP;
const CATEGORY_DIM = 7;
const SYMBOL_SIZE = 4;
function retrieveScatterData(data, dimX, dimY) {
  let result = [];
  for (let i = 0; i < data.length; i++) {
    let item = [data[i][dimX], data[i][dimY]];
    item[CATEGORY_DIM] = data[i][CATEGORY_DIM];
    result.push(item);
  }
  return result;
}
function generateGrids() {
  let index = 0;
  const grid = [];
  const xAxis = [];
  const yAxis = [];
  const series = [];
  for (let i = 0; i < CATEGORY_DIM_COUNT; i++) {
    for (let j = 0; j < CATEGORY_DIM_COUNT; j++) {
      if (CATEGORY_DIM_COUNT - i + j >= CATEGORY_DIM_COUNT) {
        continue;
      }
      grid.push({
        left: BASE_LEFT + i * (GRID_WIDTH + GAP) + '%',
        top: BASE_TOP + j * (GRID_HEIGHT + GAP) + '%',
        width: GRID_WIDTH + '%',
        height: GRID_HEIGHT + '%'
      });
      xAxis.push({
        splitNumber: 3,
        position: 'top',
        axisLine: {
          show: j === 0,
          onZero: false
        },
        axisTick: {
          show: j === 0,
          inside: true
        },
        axisLabel: {
          show: j === 0
        },
        type: 'value',
        gridIndex: index,
        scale: true
      });
      yAxis.push({
        splitNumber: 3,
        position: 'right',
        axisLine: {
          show: i === CATEGORY_DIM_COUNT - 1,
          onZero: false
        },
        axisTick: {
          show: i === CATEGORY_DIM_COUNT - 1,
          inside: true
        },
        axisLabel: {
          show: i === CATEGORY_DIM_COUNT - 1
        },
        type: 'value',
        gridIndex: index,
        scale: true
      });
      series.push({
        type: 'scatter',
        symbolSize: SYMBOL_SIZE,
        xAxisIndex: index,
        yAxisIndex: index,
        data: retrieveScatterData(rawData, i, j)
      });
      index++;
    }
  }
  return {
    grid,
    xAxis,
    yAxis,
    series
  };
}
const gridOption = generateGrids();
option = {
  animation: false,
  brush: {
    brushLink: 'all',
    xAxisIndex: gridOption.xAxis.map(function (_, idx) {
      return idx;
    }),
    yAxisIndex: gridOption.yAxis.map(function (_, idx) {
      return idx;
    }),
    inBrush: {
      opacity: 1
    }
  },
  visualMap: {
    type: 'piecewise',
    categories: ['北京', '上海', '广州'],
    dimension: CATEGORY_DIM,
    orient: 'horizontal',
    top: 0,
    left: 'center',
    inRange: {
      color: ['#51689b', '#ce5c5c', '#fbc357']
    },
    outOfRange: {
      color: '#ddd'
    },
    seriesIndex: gridOption.series.map(function (_, idx) {
      return idx;
    })
  },
  tooltip: {
    trigger: 'item'
  },
  parallelAxis: [
    { dim: 0, name: schema[0].text },
    { dim: 1, name: schema[1].text },
    { dim: 2, name: schema[2].text },
    { dim: 3, name: schema[3].text },
    { dim: 4, name: schema[4].text },
    { dim: 5, name: schema[5].text },
    {
      dim: 6,
      name: schema[6].text,
      type: 'category',
      data: ['优', '良', '轻度', '中度', '重度', '严重']
    }
  ],
  parallel: {
    bottom: '5%',
    left: '2%',
    height: '30%',
    width: '55%',
    parallelAxisDefault: {
      type: 'value',
      name: 'AQI指数',
      nameLocation: 'end',
      nameGap: 20,
      splitNumber: 3,
      nameTextStyle: {
        fontSize: 14
      },
      axisLine: {
        lineStyle: {
          color: '#555'
        }
      },
      axisTick: {
        lineStyle: {
          color: '#555'
        }
      },
      splitLine: {
        show: false
      },
      axisLabel: {
        color: '#555'
      }
    }
  },
  xAxis: gridOption.xAxis,
  yAxis: gridOption.yAxis,
  grid: gridOption.grid,
  series: [
    {
      name: 'parallel',
      type: 'parallel',
      smooth: true,
      lineStyle: {
        width: 1,
        opacity: 0.3
      },
      data: rawData
    },
    ...gridOption.series
  ]
};

    if (option && typeof option === 'object') {
      myChart.setOption(option);
    }

    window.addEventListener('resize', myChart.resize);
  </script>
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